Malicious PDF — malware analysis report

Static analysis result for SHA-256 8069a441cb6f588f…

MALICIOUS

PDF

87.5 KB Created: 2021-09-07 21:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c458add2b31d58fd42ca8cf0cc8c9980 SHA-1: 8e10208bfa953028aafcefa5b584efa38437e9e5 SHA-256: 8069a441cb6f588f235e1cb36eea9d32cfb201c2c1a9e618e4b05213d9cc6d78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites acting as hosting for other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of a link farm on disposable hosting and compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3ae8c4aa2---fetunezesenidebokewewozuf.pdf In PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/xarawebomubefosazada.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/jl5clukvjbsfrfhhra527gduug/jakowujadeberibozi.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/rifopebijunufosiz.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/gakoveragujideberedopes.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d4055548a---dodelaxopatulevuse.pdfIn PDF document text
    • http://hydrem.ru/images/file/galufa.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/nufaweker.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/texozefo.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/begegavi.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/bewijexaxokakijapo.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/vaxesuzejavin.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3af261e96c---jolakivu.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad8d8d06d7---16672515869.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/34590703810.pdfIn PDF document text
    • https://area5srl.it/file/vipunogizowovitusu.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/12454010961.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b108c47a078---dajepasilunovuvaf.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/tinekewatuvizoso.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096e149a511c---65666733808.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/xabulibozofep.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/82751f20af40ff7db2f8002e12e76647/ridiwisoxolizukefe.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/551cf9597a7de589ca0ff1caafd3d470/mabamoxojapotilatanej.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/8d83c1387361b037f8f72fcf562018e1/3174318979.pdfIn PDF document text
    • http://iltorg.ru/upload/file/kuregopos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=printable+newborn+checklist+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 18236 bytes
SHA-256: 3ea19cc91cd5ffd89161063f1114778c8e5e0eee8e7e8b15954f50ff85260182
font_01_sfnt_off00011ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C0 11036 bytes
SHA-256: d5879772c629d7599e44ff36d69dba79ece1fa104c206079368d83f5233a7201

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